JPH0621529Y2 - Classifier - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention sucks or pressure-feeds a transportation gas such as air, argon, or nitrogen gas, and utilizes the suction force or the pressure-feeding force of this gas to remove plastic or The present invention relates to a classifier used for transporting a powder or granular material that is a raw material for medicines, processed foods or the like, and for classifying the powder or granular material and dust that are transported together with a gas.

[Conventional technology]

Conventionally, the following devices have been known as a collection device for separating gas and powder particles.

First Conventional Example As shown in FIG. 13, a receiving part (01) of a plastic molding machine or the like.
Into the lid (03) attached to the upper part of the hopper-shaped container (02) installed in, for example, powder and granular material input port (04) for inputting powder and granular material such as plastic raw materials by the aerodynamic force of an air source such as a blower. In addition to providing a container, the powder particle extraction port (05) is provided at the bottom of the container (02).
The exhaust port (06) is provided at an arbitrary location on the outer peripheral side wall of the container (02).
On the other hand, a filter (07) made of punching metal or the like is provided between the lower part of the powder / granular material introduction port (04) and the exhaust port (06) in the container (02).
It is known that the filter (07) is used to separate a granular material below and a dust and gas above.

Second Conventional Example As shown in FIG. 14, a tangential inflow type reverse flow cyclone device is known. This device consists of a cylindrical part (09) and a conical part (01
The cyclone body (08) consisting of (0) is provided, and the air flow containing the granular material flows in from the granular material inlet (04) connected in the tangential direction of the upper end of the cylindrical portion (09), and the cylindrical portion (09 ), While descending while turning along the inner wall of), and further rotating several times until the lower end of the conical portion (010) is reached, a centrifugal force is applied to the powdery or granular material. Due to this centrifugal force, the granular material settles in the wall direction and is separated from the dust,
It is carried to the container (02) by the downward flow and collected. The airflow and dust from which the powder and granules have been separated swirl up in the cyclone body and are discharged to the outside through the discharge port (06).

As a trapping device of the prior application from this application, Japanese Patent Application No. 62-
The invention of 289589 (JP-A-1-130710) has also been proposed. This trapping device has a separation chamber provided with an exhaust port, and a discharge port of a transportation path that is exposed from the upper side to the lower side in the separation chamber, and the discharge port is provided on the lower side facing the discharge port. A container main body having a powder particle collecting port forming an annular slit between the container main body is provided, and an extraction port for adjusting the final settling velocity of the powder is formed on the side wall of the container main body.

[Problems to be solved by the device]

However, in the first conventional example having the above-mentioned configuration, the filter (07) is apt to be clogged with powder particles, dust, etc., and in some cases adheres and remains. Therefore, even if air is blown in the opposite direction to the exhaust direction, it is difficult to remove dust and particles that are clogged or adhered to the filter (07), and the lid (03) must be removed and the container (02) must be removed. The filter (07) must be removed from the filter (07) and a brush is applied to a large number of holes in the filter (07) to remove dust and particles remaining on the filter (07). It was troublesome and troublesome.

Further, in the above-mentioned first conventional example, because of the above-mentioned drawbacks, the brushing work of the filter (07) is required every time when changing the material for transporting the granular material of different colors and materials. Therefore, changing the material takes time and is troublesome, and if the filter (07) is incompletely brushed, the previous powder and granules will remain on the powder and granules after the material change. There was a problem that the previous powder and granules were mixed.

In the second conventional example, since the cyclone main body for swirling the powder and granules is indispensable, the cyclone main body becomes large and the installation space becomes large, and the device of the cyclone main body becomes complicated. there were.

Also, depending on the granular material, holes may be created when the wall surface in the cyclone body is worn due to the swirling, and when the dust is light, the updraft becomes larger than the inertial force, and it becomes impossible to separate it, and it becomes impossible to separate with the wind. Go out. Further, even when the amount of exhausted air is small, the inertial force is weakened and the separation becomes impossible.

In order to improve the separation effect, it is sufficient to make the cyclone small in size, but this is not effective because the pressure loss becomes large, and it was unavoidable to increase the size as described above.

In the one disclosed in Japanese Patent Application Laid-Open No. 1-130710, which is a prior application of the present application, since the extraction port is formed in the side wall of the container body, the wind speed of the powder mixed gas is suppressed before being supplied into the container body. . Therefore, the scattering of fine powder from the annular slit between the discharge port of the transport path and the powder collecting port is reduced, and the efficiency of collecting fine powder in the container body is improved, but fine particles close to fine powder are obtained. However, there is a problem that the dust (dust) is collected in the container body.

This invention intends to provide a classifying device which solves the problems of the first conventional example, the second conventional example, and the prior invention.

[Means for Solving the Problems]

As a means for solving the above-mentioned problems, the present invention provides a transportation path for transporting powdery particles together with gas, a separation chamber for classifying powdery particles discharged from this transportation path into gas and dust, and this classification. A container body for collecting the granular material, the separation chamber is provided above the granular material collecting port of the container body, and an exhaust port is formed in a separation chamber box forming the separation chamber. On the other hand, a discharge port of a transportation path is exposed in the separation chamber, and an annular slit that forms a gap is formed between the edge of the discharge port and the upper edge of the particulate material collection port, At least the side wall of the container body is non-perforated. Here, the granular material means plastic, pharmaceuticals,
It refers to a granular material that is a raw material for processed foods and the like, and is arbitrary as long as it can be transported together with gas. The gas includes air, argon, nitrogen gas and the like.

The rim of the discharge port of the transportation path is located directly above the upper rim of the particulate collection port, and the diameter of the discharge port is the same or slightly smaller than the diameter of the particulate collection port. By doing so, the separation efficiency of the powder and granules in the annular slit from gas and dust is increased, and the classification efficiency of the powder and granules is also increased.

The separation chamber box forming the separation chamber is preferably detachably provided to one or both of the transportation path and the container body, which is convenient and suitable for cleaning, but these may be integrated.

It is preferable that the gap between the annular slits can be arbitrarily changed, because the separation / classification efficiency is higher depending on the particle size of the powder or granule.

The transportation path has a plurality of powder / granular material selection paths formed on its annular slit, and the powder / granular material particles can be arbitrarily selected from the powder / granular material selection path to be transported.

[Action]

The operation of the present invention will be described below with reference to the drawings which are embodiments.

By means of the pressure-feeding aerodynamic power source (3) such as a blower connected to the inlet end side of the transport path (1), or the suction-type aerodynamic power source such as a vacuum pump or blower connected to the exhaust port (24) side. Due to the suction force, the granular material is transported from the transportation path (1) together with the airflow, and is discharged from the discharge port (4) of the transportation path (1) into the separation chamber (21).

In the separation chamber (21), the discharge port (4) of the transportation path (1) is exposed, and the rim (4a) of the discharge port (4) and the upper rim (4) of the particulate collection port (23) ( 23a)
Between, and to form an annular slit (60) forming a gap (61), since at least the side wall of the container body (10) is non-perforated, in this annular slit (60), a large particle The body and small particles and dust and gas are separated, and the former large particles are dropped into the container body (10) through the particle collection port (23), and the latter small particles are separated. Particles of particles, dust and gas are discharged from the exhaust port (24).

That is, particles with a large mass or particles with a large particle size
Since the granular material of (m) has inertia due to its air flow transportation energy, it falls downward without entering into the annular slit (60) by its inertial force, and falls from the granular material collecting port (23) to the container. Collected in the body (10). On the other hand, since at least the side wall of the container body is non-perforated, the wind speed of the powder / granule mixed gas hardly changes until it reaches the inside of the container body, and the amount of exhaust from the annular slit is large, so that the particle with a small mass or the particle diameter is small. Particle (n)
Exhaust port (24) along with transport gas due to increased dust and dust scattering
Is efficiently discharged from the system.

Even if the granules are caught in the annular slit (60), the particles of the caught granules are collided and knocked off by the inertial force of the particles dropped from above, and the granule particles become the annular slit (60 ) Is not retained.

Also, since the granular particles that try to return to the upper side are knocked off by the particles that fall from the upper side, the annular slit is also used.
(60) It doesn't get into.

The diameter (D ₀ ) of the discharge port (4) of the transportation path (1) is the same or slightly smaller (D ₀ ≤ D ₁ ) compared to the diameter (D ₁ ) of the particulate collection port (23). It is preferable to do so, and in this case, the inertial force of the particles of the granular material and the above-mentioned knocking effect from above can be effectively achieved.

The separation chamber box (20) that forms the separation chamber (21) is
If it is detachably attached to one or both of (1) and the container body (10), it is convenient for cleaning the separation chamber box (20), the transportation path (1), and the container body (10).

[First Embodiment] A first embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

This classifier is a transportation path (1) for transporting powders and granules which are various raw materials together with gas, and a separation chamber (21) for classifying the powders and granules discharged from this transportation path (1) into gas and dust. And a container body (10) for collecting the classified powder and granules.

The container body (10) has a funnel shape and the side wall is non-perforated and the outlet (1
It is formed of a main body part (11) having 0a) and a lid part (12) closing an upper opening of the main body part (11). Opening of lid (12) (1
The mounting cylinder portion (22) of the separation chamber box (20) is fitted in 3), and the inside of the mounting cylinder portion (22) serves as a powdery or granular material collecting port (23). The powdery particle collection port (23) can be formed by the separation chamber box (20) as described above, or can be formed by the container body (10) itself, and the separation chamber box (20) and the container body (10) can be formed. Opening (1
It may be formed by a throwing tube (not shown) provided between and 3), and the design can be appropriately changed.

The separation chamber box (20) is attached to the upper surface of the container body (10) (the lid (1
2)), attach the mounting tube (22) to the opening (13) of the lid (12).
The separation chamber (21) is formed to communicate with the position above the particulate collection port (23) so that it is separated from the particulate on one side wall. An exhaust port (24) for discharging gas, dust, etc. is formed. The exhaust port (24) is formed on any one side wall of the peripheral wall of the separation chamber box (20),
Alternatively, a plurality of them may be formed.

In the separation chamber (21) of the separation chamber box (20), the transportation path (1)
The discharge port (4) is exposed. The edge of this outlet (4) (4
An annular slit (60) forming a gap (61) is formed between a) and the upper edge (23a) of the powdery or granular material collecting port (23).

The mouth edge (4a) of the discharge port (4) of the transportation path (1) is the powder particle collection port (23).
It is located directly above the upper edge (23a) of the nozzle, and the diameter (D ₀ ) of its discharge port (4) is the same or slightly smaller than the diameter (D ₁ ) of the particulate collection port (23). It is desirable that (D ₀ ≤D ₁ ).

The separation chamber box (20) that forms the separation chamber (21) is
It is detachable from one or both of (1) and the container body (10).

The gap (61) of the annular slit (60) is set according to the particle diameter of the powder or granular material, and it is desirable that the gap (61) can be freely changed.

In FIG. 2, (2) is a transportation pipe having a pressure-feeding pneumatic power source (3) such as a blower connected to the inlet end side, and the transportation path (1) is connected to the outlet end side of the transportation pipe (2). Are integrally formed, or the short transportation pipe forming the transportation path (1) is connected. That is, as shown in FIG. 2, in this embodiment, powder particles are sent from the aerodynamic power source (3) to the transportation pipe (2) together with the gas by the aerodynamic force of the gas, and the separation chamber box ( In the separation chamber (21) of 20), the particulates are separated from the transport gas and dust, the particulates enter the main body (11), and the transport gas and dust are the exhaust port (24).
It is designed to be discharged more out of the system.

An application example of the classification device (A) of the first embodiment using the suction type as the aerodynamic power source (3) will be described with reference to FIG. That is, the classifier (A) and a feeder such as a screw feeder (B) are connected via a transport pipe (C) that forms a granular material transport path, and the classifier (A) has a vacuum as an air source. Pump (D) goes through separation chamber box (20) to exhaust pipe (E)
Connected to the vacuum pump (D), and the suction force associated with driving the vacuum pump (D) to the powder and granular material supply hopper (F) pelletized plastic raw materials and various powdered raw materials to the classifier (A) Transport and separate gas and dust for transportation
It is separated at (21) and discharged to the outside through the exhaust pipe (E). On the other hand, the powder or granular material contained in the container body (10) of the classifying device (A) is supplied to the receiving portion (J) of a synthetic resin molding machine or the like in this embodiment.

[Second Embodiment] FIGS. 3, 4, 5, and 6 show a second embodiment. The second embodiment is a more specific version of the first embodiment, and only the separation chamber box (20) can be selected as a single unit device.

The connection chamber (1a), which is also part of the transportation route (1), has a separation chamber (21).
It is detachably connected to the separation chamber box (20) and has a tight fit through the packing (5).
It is fixed by a bolt (6) from the side wall of (20). This connecting transport pipe (1a) can be removed by screwing the bolt (6) above, and even if there is clogging due to dust or adhesion of powder or granules, it can be easily removed from the separation chamber box (20). It can be removed. Also, depending on the type of powder,
The gap (61) of the annular slit (60) can be appropriately selected according to the particle diameter.

The powdery particle collecting port (23) is formed by a mounting cylinder (22a) which is detachably fitted into an opening (13) formed in the bottom wall of the separation chamber box (20). The mounting tube (22a) is
An outer collar (23b) is formed at the upper end of the box (3), and the lower end opening (23c) is mounted on the step (13a) formed in the lower opening (13) of the separation chamber box (20). ) Is exposed to the inside of the container body (10). With the upper edge (23a) of this mounting cylinder (22a),
An annular slit (60) forming a gap (61) is formed in the pipe of the connection transport pipe (1a) and the rim (4a) of the discharge port (4).

Since the attachment tube (22a) can be replaced as appropriate, like the connection transportation tube (1a), it can be selectively used according to the powder or granular material. Exhaust port (24) of the separation chamber box (20)
Opens at a position close to the annular slit (60) and separates
The classification effect is further improved.

The separation chamber box (20) is a lower plate (25) of the separation chamber box (20).
The container main body (10) having an arbitrary structure is attached to this, but in this embodiment, the structure shown in FIG. 6 is adopted. That is, the lower end (25) of the separation chamber box (20) is detachably fitted to the upper end opening of a cylindrical container body (10) made of a transparent body and having a non-perforated side wall from below. The container body (10) is sandwiched between the lower plate (25) and the lower mounting plate (26) of the separation chamber box (20) and is sandwiched by the support rods (27). By removing, the separation chamber box (20) and the lower mounting plate (26) can be freely separated and removed. Incidentally, (28) in FIG. 3 is a fitting hole for fitting the upper part of the container body (10).

[Third Embodiment] FIGS. 7 to 9 show a third embodiment. In the third embodiment, the connecting transport pipe (1a), which also serves as a lid for closing the upper opening of the separation chamber (21) of the separation chamber box (20), has one discharge port (4) at the bottom and A plurality of powder / granule selection passages (30) (three in this embodiment) communicating with the discharge port (4) are formed, and the powder / granule is arbitrarily selected from the powder / granule selection passages (30). In addition to providing a cleaning air supply hole (31) in the powder / granule selection path (30), a plurality of types of powder / granular material transfer pipes (not shown) can be provided. It is characterized in that it can be separately connected, and that the dust trapped in the annular slit (60) formed in the same manner as in the first embodiment and dust particles remaining due to adhesion can be favorably removed by cleaning air. is there.

Similar to the first embodiment, the powdery particle collecting port (23) of the third embodiment has a mounting cylinder part (in the form of a taper) integrally formed with the bottom wall of the separation chamber (21) formed in the upper part. The container body is made of a transparent material and is formed by
The upper opening (15) of (10) is fitted with an intermediate tube (32) having a sealing action interposed.

In the third embodiment, when the degree of clogging or the residue of adherence of powder or granular material is small, the air supply hole (31) is not required to remove the connection transport pipe (1a) having the powder or granular material selection path (30). Therefore, it has an advantage that dust can be removed by cleaning air. In addition, when changing the material, it is possible to use a different material from the powder / granule selection path (30) of the previous material, so the powder / granulate particles remaining near the powder / granule selection path (30), etc. There is an advantage that it is easy to avoid the adverse effect due to.

In the case of the third embodiment, it is also possible to transport a plurality of types of powdery particles into the container body (10) in a mixed state. Further, the number of the air supply holes (31) for the cleaning air is not limited to one and may be two or more and is arbitrary. Incidentally, (33) is a connecting member to the air supply hole (31).

[Fourth Embodiment] FIGS. 10 and 11 show a fourth embodiment. In this fourth embodiment, one rotatable transport path (1) and this transport path (1)
A plurality of powder / granule selection paths (35) ... (35) (three in this embodiment are formed, but it is optional), and the transportation path (1) is connected to a predetermined powder / granular material. It is characterized in that it can rotate so as to communicate with the selection path (35) and automatically select and switch the particle selection path (35).

That is, the transportation path (1) is inclined as shown in FIG. 10 and the discharge port (4) at the lower end thereof is provided at the rotation center position, and the transportation path (1) is
The upper end insertion opening (36) can be repositioned on a circular locus by rotating the.

As a means for rotating the transportation path (1), in this embodiment, a large gear (37) is fixed to the body portion (1b) of the transportation path (1), and a small gear (38) meshing with the large gear (37). ) Is provided, and a drive motor (39) in which a drive shaft (40) is connected to the small gear (38) is provided, and the small gear is driven by driving the drive motor (39).
(38), the transportation path (1) is rotated via the large gear (37). (41) is the inner wall of the separation chamber box (20) and the body (1
It is a bearing that is interposed between b) and rotatably supports the body portion (1b). The rotation means of the transportation path (1) is not limited to the gear mechanism described above, and may be a belt mechanism or other mechanism.

In addition, the rotational position of the transportation path (1), the position detection sensor (43),
(44) is arranged so as to be positioned for each powder / grain selection path (35). In other words, this position detection sensor (4
3), (44) detects the predetermined rotation angle position of the transportation path (1) and properly communicates with a predetermined powder or granular material selection path (35) among the plurality of powder or granular material selection paths (35). I am trying. (45) is the transportation route (1)
This is a sensor that confirms the disconnection state between the switch plate (53) and the switch plate (53).

The separation chamber box (20) is composed of a side wall (20a) in which an exhaust port (24) is partially formed, and a bottom plate (20b) in which a particulate material collecting port (23) is formed. A part surrounded by the side wall (20a) and the bottom plate (20b) is defined as a separation chamber (21), and a transportation path is provided in the separation chamber (21).
The discharge port (4) of (1) is exposed, and there is a gap (61) between the rim (4a) of the discharge port (4) and the upper rim (23a) of the particulate material collection port (23). ) Forming an annular slit (60).

Incidentally, (42), (46) and (47) are sealing materials.

A plurality (three in this embodiment) of the granular material selection paths (35) ... (35) are provided at equal positions of the switching plate (53).

Each granular material selection path (35) is connected to the switching plate (53) and is connected to the connection transportation pipe (50), and the transportation path fixed to the connection transportation pipe (50) with a fastening member (52) such as a nut. It consists of (51) and. (Five
4) is packing.

The switching plate (53) has a piston of a fluid pressure cylinder (55) fixed to the horizontal plate (20c) on one side of the upper part of the separation chamber box (20).
(56) is a fastening member (5
It is fixed in 8). Rotate the transportation route (1) to select the granular material selection route
When switching (35), the fluid pressure cylinder (55) is operated and the switching plate (53) is moved upward by the piston (56) to switch the switching plate (53).
Is separated from the transportation path (1), the transportation path (1) is aligned with the desired material selection path (35) (connection transportation pipe (50)), and then the switching plate (53) is placed through the piston (56). By moving downward, the desired granular material selection path (35) (connection transportation pipe (50)) and the transportation path (1) are connected for communication. The pushing height of the switching plate (53) is adjusted by adjusting the upper moving height position of the adjusting member (57). Switching plate (53)
The switching means of is not limited to the above configuration, and can be appropriately modified in design.

The apparatus of this embodiment includes the bottom plate (20b) and the container body (10).
A self-cleaning mechanism (48) is provided between the self-cleaning mechanism (48) and the self-cleaning mechanism (48). 48a) A container body (10) with a tubular shape and a non-perforated side wall
It is designed to be supplied to the entrance of.

The jetting of the gas causes the cyclone action of the above-mentioned second conventional example, and the centrifugal force separates the granular material from the transport gas and dust as described above. That is, the powder and granules are dropped downward in the container body (10), while the transport gas, dust, etc. are discharged from the exhaust port (24) through the annular slit (60).

The method of pneumatically transporting the powdery or granular material is not limited to the suction type or the pressure feeding type shown in each of the embodiments, and other pressure feeding type or suction type may be appropriately designed and implemented.

[Effect of device]

According to this invention, a separation chamber is provided above the powder / granular material collection port of the container body, and an exhaust port is formed in the separation chamber box forming this separation chamber, while the discharge of the transportation path is provided in the separation chamber. An outlet is exposed, and an annular slit that forms a gap is formed between the edge of the discharge port and the upper edge of the powdery or granular material collecting port, and at least the side wall of the container body is non-perforated. Therefore, it has the following effects.

(1) According to this invention, at least the side wall of the container body for collecting the powder and granules has no hole, so that the annular slit formed by the discharge port of the transportation path and the upper edge of the powder or granular material collection port is used. Since the air velocity of the mixed powder of particles is higher than that of Japanese Patent Application No. 62-289589 (JP-A-1-130710),
Dust (particles with a small mass or particle size) is scattered from the annular slit, and classification efficiency with coarse particles (particles with a large mass or particle size) is improved. That is, the removal rate of dust discharged from the exhaust port becomes high.

(2) In this invention, the particles are not separated and collected by the filter as in the first conventional example, but the particles are classified as the transportation gas and the dust by the flow of the transportation gas and the inertial force of the particles. While the particles are classified and collected in the container body in the state, the dust is discharged from the gap of the annular slit together with the transport gas, resulting in smooth classification without clogging in the container body or in the separation chamber and residue of powder particles. To be done.

(3) Further, since an annular slit is formed which forms a gap formed between the edge of the discharge port and the upper edge of the particulate material collection port, even if the annular slit has an eye for dust or the like. Even if there is clogging or residue of adhered particles, the clogging or residue of adhered particles can be easily removed by the inertial force due to the flow of the transport gas and the weight of the particles.

(4) In addition, a simple structure of simply forming the annular slit in the separation chamber is sufficient without using a large-scale device such as the cyclone device of the second conventional example, and the entire device can be downsized and installed. Space can also be reduced.

The configurations described in claims (2) to (5) have the same effects as described above.

[Brief description of drawings]

1 to 11 all show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of an essential part of the first embodiment, FIG. 2 is a longitudinal sectional view of an entire separation chamber box and a container body, and FIG.
FIG. 4 is a vertical sectional view of an essential part of the embodiment, FIG. 4 is a plan view of FIG.
FIG. 7 is a left side view of FIG. 3, FIG. 6 is a side view showing an application example of the second embodiment, and FIG. 7 is a longitudinal sectional view of a main part of the third embodiment.
Figure is a plan view of Figure 7, Figure 9 is a left side view of Figure 7, 10
FIG. 11 is a vertical sectional view of the fourth embodiment, FIG. 11 is a plan view with the switching plate of FIG. 10 removed, and FIG. 12 is a schematic system diagram showing an application example of the present invention. FIG. 13 is a schematic front view of the first conventional example, and FIG. 14 is a schematic front view of the second conventional example. (1) ... Transport path, (1a), (50) ... Connecting transport pipe, (2), (51) ... Transport pipe, (3) ... Power source, (4) ... Discharge port, (4a) ... Discharge port The rim of the
(10) ... Container body, (20) ... Separation chamber box, (21) ... Separation chamber, (22) ... Mounting cylinder part, (22a) ... Mounting cylinder, (23) ... Powder / granule collection port, (23a) ) ... Upper edge of powder collection port, (30), (35) ... Powder selection path, (37) ... Large gear, (38) ... Small gear, (53) ... Switching plate, (55) )… Fluid pressure cylinder, (60)… Annular slit, (6
1)… Gap.

Claims (5)

[Scope of utility model registration request] 1. A transportation path (1) for transporting powder and granules together with gas.
And a separation chamber (21) for classifying the powder and granules discharged from the transportation path (1) into gas and dust, and a container body (10) for collecting the classified powder and granules, wherein the container The separation chamber (21) is provided above the powder and particulate matter collection port (23) of the main body (10), and the separation chamber box (20) forming the separation chamber (21) has an exhaust port (2
4) is formed, the discharge port (4) of the transportation path (1) is exposed in the separation chamber (21), and the edge (4a) of the discharge port (4) and the particulate matter trapping are formed. There is a gap (61) between the upper edge (23a) of the inlet (23).
A classifying device, characterized in that an annular slit (60) is formed, and at least the side wall of the container body (10) is non-perforated. 2. The rim (4a) of the discharge port (4) of the transportation path (1) is located immediately above the upper rim (23a) of the particulate matter collection port (23), and the discharge port (4a) The diameter (D ₀ ) of 4) is the same or slightly smaller (D ₀ ≤ D ₁ ) as compared with the diameter (D ₁ ) of the particulate material collection port (23).
The classifier according to item (1). 3. A separation chamber box (20) forming a separation chamber (21).
The classification device according to claim (1) or (2), wherein the classification device is detachably provided on one or both of the transportation path (1) and the container body (10). 4. The classifying device according to claim 1, wherein the gap (61) of the annular slit (60) can be changed arbitrarily. 5. The transportation path (1) is provided with a plurality of powder / granular material selection paths (30), (35) for the annular slit (60). The classification device according to any one of claims (1) to (4), wherein the powder or granular material is arbitrarily selected from (35) and can be transported.